After lots of frustration it appears we cannot, even within the same household, share a book, but must either have all the books from one account on all ereaders or purchase the same book twice to place it on two readers. Then in setting up email it turns out that this too is a problem for sympatico accounts, and then there is adobe flash needed for some video on demand feeds but a problem for the Arc. My wife says she is taking it back and may get the Nexus. What a shame